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Search Results: 1 - 10 of 35435 matches for " Ji Hun Kim "
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Rest Frame Subjet Algorithm With SISCone Jet For Fully Hadronic Decaying Higgs Search
Ji-Hun Kim
Physics , 2010, DOI: 10.1103/PhysRevD.83.011502
Abstract: The rest frame subjet algorithm is introduced to define the subjets for the SISCone jet. Using it, an IR and collinear safe jet shape observable N-subjettiness, $\tau_N^{j}$, is defined to discriminate the fat jet from a highly boosted color singlet particle decaying to N partons and the QCD jet. Using rest frame subjets and $\tau_2^{j}$ on dijets from highly boosted $\it H / W / Z$ bosons through $pp \to \it H W$, $\it H Z$, we found that statistical significance of the signal is about $2 \sigma$ at the LHC with $\mathcal{L} \sim 30 \mathrm{fb^{-1}}$ at $14 \tev$.
Superstring standard model from Z_{12-I} orbifold compactification with and without exotics, and effective R-parity
Kim, Jihn E.;Kim, Ji-Hun;Kyae, Bumseok
High Energy Physics - Phenomenology , 2007, DOI: 10.1088/1126-6708/2007/06/034
Abstract: We construct a supersymmetric standard model in the context of the $Z_{12-I}$ orbifold compactification of the heterotic string theory. The gauge group is $SU(3)_c\times SU(2)_L\times U(1)_Y\times U(1)^4\times[SO(10)\times U(1)^3]'$. We obtain three chiral families, $3\times\{Q,d^c,u^c,L,e^c,\nu^c\}$, and Higgs doublets. There are numerous neutral singlets many of which can have VEVs so that low energy phenomenology on Yukawa couplings can be satisfied. In one assignment (Model E) of the electroweak hypercharge, we obtain the string scale value of $sin^2\theta_W^0={3/8}$ and another exactly massless {\it exphoton} (in addition to the photon) coupling to exotic particles only. There are color triplet and anti-triplet exotics, $\alpha$ and $\bar{\alpha}$, $SU(2)_L$ doublet exotics, $\delta$ and $\bar{\delta}$, and $SU(3)_c\times SU(2)_L$ singlet but $Y={2/3},-{1/3},-{2/3},{1/3}$ exotics, $\xi,\eta,\bar{\xi}, \bar{\eta}$. We show that all these vector-like exotics achieve heavy masses by appropriate VEVs of neutral singlets. One can find an effective R-parity between light (electroweak scale) particles so that proton and the LSP can live sufficiently long. In another assignment (Model S) of the electroweak hypercharge, there does not appear any exotic particle but $sin^2\theta_W^0={3/14}$.
SO(10)-like Superstring Standard Model with R-parity from the Heterotic String
Kim, Jihn E.;Kim, Ji-Hun;Kyae, Bumseok
High Energy Physics - Phenomenology , 2007,
Abstract: We construct a supersymmetric standard model in the context of the Z_{12-I} orbifold compactification of the E_8 x E_8' heterotic string theory. The gauge group is SU(3)_c x SU(2)_L x U(1)_Y x U(1)^4 x [SO(10) x U(1)^3]' with sin^2\theta_W = 3/8. We obtain three families of SO(10) spinor-like chiral matter states, and Higgs doublets. All other extra states are exactly vector-like under the standard model gauge symmetry. There are numerous standard model singlets, many of which get VEVs such that only the standard model gauge symmetry survives and desired Yukawa couplings can be generated at lower energies. In particular, all vector-like exotic states achieve superheavy masses and the R-parity can be preserved.
Amplification of endpoint structure for new particle mass measurement at the LHC
Won Sang Cho,Jihn E. Kim,Ji-Hun Kim
Physics , 2009, DOI: 10.1103/PhysRevD.81.095010
Abstract: We introduce a new collider variable, MCT2, named as constransverse mass. It is a mixture of `stransverse mass(MT2)' and `contransverse mass(MCT)' variables, where the usual endpoint structure of MT2 distribution can be amplified in the MCT2 basis by large Jacobian factor which is controlled by trial missing particle mass. Thus the MCT2 projection of events increases our observability to measure several important endpoints from new particle decays, which are usually expected to be buried by irreducible backgrounds with various systematic uncertainties at the LHC. In this paper we explain the phenomenology of endpoint amplification in MCT2 projection, and describe how one may employ this variable to measure several meaningful mass constraints of new particles.
Hydrochemistry for the Assessment of Groundwater Quality in Korea  [PDF]
Jong Yeon Hwang, Sunhwa Park, Hyun-Koo Kim, Moon-Su Kim, Hun-Je Jo, Ji-In Kim, Gyeong-Mi Lee, In-Kyu Shin, Tae-Seung Kim
Journal of Agricultural Chemistry and Environment (JACEN) , 2017, DOI: 10.4236/jacen.2017.61001
Abstract: Understanding of the aquifer hydraulic properties and hydrochemical characteristics of water is crucial for management plan and study skims in the target area, and flow motions and chemical species of groundwater are regarded as precious information on the geological history of the aquifers and the suitability of various usages. Cations and anions of groundwater are used to estimate the characteristics and origin of groundwater. In this study, we try to evaluate the quality of groundwater based on the comparison of the physiochemical characteristics and distribution of cations and anions in groundwater from rural areas. Therefore we focused on the evaluation of groundwater as some specific purposes such as agricultural and industrial use, general types of groundwater, lithological origin of chemical component in groundwater. In this point of view, major objectives of this study were grouped as following three categories: 1) quality assessment of groundwater as a special usage (agricultural, industrial); 2) determination of groundwater types; 3) tracing of ion sources of groundwater. The quality of agricultural water was evaluated using SAR, sodium (%), RSC, PI, SSP, MH, PS, and Kelly’s ratio, and was classified as SAR (Excellent (100%)), Sodium ((Excellent (34%), Good (55%), Permissible (9%), Doubtful (1.6%), Unsuitable (0.4%)), RSC (Good (95.7%), Medium (3.5%), Bad (0.8%)), PI((Excellent (40.6%), Good (59%), Unsuitable (0.4%)), SSP ((Excellent (26.3%), Good (59.8%), Fair (13.1%), Poor (0.8%)), MH ((Acceptable (94.4%), Non-Acceptable (5.6%)), Kelly’s Ratio ((Permissible (93%), Non-Permissible (7%)), PS ((Excellent to Good (98%), Good to Injurious (1.2%), and Injurious to Unsatisfactory (0.2%)). Evaluation based on the Wilcox diagram was classified as “excellent to good” or “good to permissible”, and the water quality evaluated using the U.S. salinity Laboratory’s Diagram was classified as C1S1 (Excellent/Excellent) and C2S1 (Good/Excellent). And, in the applications of two factors of Langelier Saturation Index (LSI) and Corrosive ratio (CR), we could get similar results for defining the suitabilities of groundwater for the industrial purpose. And the groundwater samples were also classified groundwater using the Piper diagram and estimated the origin of ions using the Gibbs and Chadah diagram, and the classifications based on the Piper diagram showed that the types of the groundwater are \"\" type?and \"\" type. And,
Clinical outcomes of arthroscopic single and double row repair in full thickness rotator cuff tears
Ji Jong-Hun,Shafi Mohamed,Kim Weon-Yoo,Kim Young-Yul
Indian Journal of Orthopaedics , 2010,
Abstract: Background: There has been a recent interest in the double row repair method for arthroscopic rotator cuff repair following favourable biomechanical results reported by some studies. The purpose of this study was to compare the clinical results of arthroscopic single row and double row repair methods in the full-thickness rotator cuff tears. Materials and Methods: 22 patients of arthroscopic single row repair (group I) and 25 patients who underwent double row repair (group II) from March 2003 to March 2005 were retrospectively evaluated and compared for the clinical outcomes. The mean age was 58 years and 56 years respectively for group I and II. The average follow-up in the two groups was 24 months. The evaluation was done by using the University of California Los Angeles (UCLA) rating scale and the shoulder index of the American Shoulder and Elbow Surgeons (ASES). Results: In Group I, the mean ASES score increased from 30.48 to 87.40 and the mean ASES score increased from 32.00 to 91.45 in the Group II. The mean UCLA score increased from the preoperative 12.23 to 30.82 in Group I and from 12.20 to 32.40 in Group II. Each method has shown no statistical clinical differences between two methods, but based on the sub scores of UCLA score, the double row repair method yields better results for the strength, and it gives more satisfaction to the patients than the single row repair method. Conclusions: Comparing the two methods, double row repair group showed better clinical results in recovering strength and gave more satisfaction to the patients but no statistical clinical difference was found between 2 methods.
Selection of Health Care Workers for Screening for Latent Tuberculosis Infection  [PDF]
Jin Young Lee, Ji Young Park, Myung Shin Kim, Je Hun Kim, Jin-Young Lee
Journal of Tuberculosis Research (JTR) , 2019, DOI: 10.4236/jtr.2019.72007
Abstract: Introduction: The rate of latent tuberculosis infections (LTBIs) in health care workers (HCWs) is higher than that in non-HCWs. We studied to investigate the prevalence and risk factors of LTBIs and the acceptance rate for treatment of LTBI among HCWs in South Korea, a country with an intermediate tuberculosis (TB) burden. Methodology: LTBI screening was conducted for HCWs at a tertiary and a secondary hospital from April 2017 to August 2017. This was a retrospective study included all HCWs who underwent LTBI examination. HCWs were classified by the degree of risk into four groups, based on two factors: possibility of exposure to TB, and impact on patients at the time of TB onset in the HCWs. The interferon-gamma release assay was used for the diagnosis of LTBI. Results: A total of 1326 HCWs were included; they comprised 801 HCWs from a tertiary hospital and 525 from a secondary hospital. A total of 235 (17.7%) HCWs were diagnosed with LTBIs. According to risk classification, there was no significant difference (P = 0.24). In multivariate analysis, age was the only independent risk factor (P < 0.001). The acceptance rate for LTBI treatment was 60.43%, and there were no associated factors in multivariate analysis. Conclusions: HCWs did not show any significant difference in the rate of LTBI by the degree of risk, and age was the independent risk factor. LTBI screening should be conducted for all HCWs regardless of risk classification.
Duodenal obstruction after successful embolization for duodenal diverticular hemorrhage: A case report
Yu Jin Kwon, Ji Hun Kim, Seung Hyoung Kim, Bong Soo Kim, Heung Up Kim, Eun Kwang Choi, In Ho Jeong
World Journal of Gastroenterology , 2009,
Abstract: We present a 69-year-old woman with a duodenal obstruction after successful selective transcatheter arterial embolization (TAE) for a duodenal diverticular hemorrhage. Two weeks after TAE, the patient showed abrupt symptoms of duodenal obstruction. Resolving hematomas after successful selective transcatheter arterial embolization should be thoroughly observed because they might result in duodenal fibrotic encasement featuring inflammatory duodenal wall thickening, duodenal deformity, dysmotility, and finally obstruction.
Industrial Pipe-Rack Health Monitoring System Based on Reliable-Secure Wireless Sensor Network
Jong-Han Lee,Ji-Eun Jung,Nam-Gyu Kim,Byung-Hun Song
International Journal of Distributed Sensor Networks , 2012, DOI: 10.1155/2012/641391
Abstract: Energy and power industrial plants need to improve the health monitoring systems of their facilities, particularly high-risk facilities. This need has created a demand for wireless sensor networks (WSNs). However, for the application of WSN technology in large-scale industrial plants, issues of reliability and security should be fully addressed, and an industrial sensor network standard that mitigatesthe problem of compatibilitywith legacy equipment and systems should be established. To fulfill these requirements, this study proposes a health monitoring system of the pipe-rack structure using ISA100.11a standard. We constructed the system, which consists of field nodes, a network gateway, and a control server, and tested its operation at a large-scale petrochemical plant. The data obtained from WSN-based sensors show that the proposed system can constantly monitor and evaluate the condition of the pipe-rack structure and provide more efficient risk management. 1. Introduction Energy and power plants, although a critical element of a national infrastructure, are also high-risk facilities. Accidents that occur in industrial plants cause significant loss of life and property, which threatens national economies. From the gas explosion accident at the Union Carbide pesticide plant in Bhopal, India to the recent massive explosion during the operation of a coal-fired plant in Connecticut, we know that accidents at industrial plants often have catastrophic results in the form of property damage and fatalities. Thus, to secure the safety of the industrial plant facilities, we should construct a health monitoring system of pipe-rack structures, which typically support cables and pipes conveying resource material between equipment, with reliable and secure detection and communication technologies. In addition, the pipe-rack structures require a continuous monitoring technique that can evaluate the performance and the soundness of the structure [1]. Structural health monitoring system has gradually become a technique for ensuring the health and the safety of civil infrastructures. Furthermore, some recent advances in wireless sensor technologies have greatly explored wireless sensors for structural monitoring of civil engineering structures, such as long-span bridges and high-rise buildings [2, 3]. Network monitoring systems composed of low-cost wireless sensors were successfully installed to monitor the dynamic response of the bridge structures [4, 5]. In particular, high-rise buildings have used the global positioning system (GPS), capable of wirelessly
Type 2 diabetes genetic association database manually curated for the study design and odds ratio
Ji Lim, Kyung-Won Hong, Hyun-Seok Jin, Yang Kim, Hun Park, Bermseok Oh
BMC Medical Informatics and Decision Making , 2010, DOI: 10.1186/1472-6947-10-76
Abstract: The list of publications used in this study was collected from the HuGE Navigator, which is an online database of published genome epidemiology literature. Because type 2 diabetes genetic association database (T2DGADB) aims to provide specialized information on the genetic risk factors involved in the development of type 2 diabetes, 701 of the 1,771 publications in the type 2 Diabetes case-control study for the development of the disease were extracted.In the database, the association results were grouped as either positive or negative. The gene and SNP names were replaced with gene symbols and rsSNP numbers, the association p-values were determined manually, and the results are displayed by graphs and tables. In addition, the study design in publications, such as the population type and size are described. This database can be used for research purposes, such as an association and functional study of type 2 diabetes related genes, and as a primary genetic resource to construct a diabetes risk test in the preparation of personalized medicine in the future.The prevalence of type 2 diabetes has reached epidemic proportions worldwide with the largest increase in Asia, Africa and South America [1]. The incidence of life-threatening complications of diabetes, such as retinopathy, nephropathy and lower-limb amputation, caused by the continued exposure of tissue to the high glucose has increased [2]. Since hyperglycemia can be prevented and reversed significantly by lifestyle changes, including the exercise and nutrition, diabetes risk tests, such as one provided by the American Diabetes Association http://www.diabetes.org webcite, have been used to alarm various high risk groups. However, an increase in the incidence of diabetes has not been stopped over the last decade, highlighting the need for new approaches. According to the World Health Organization (WHO), the number of people with type 2 diabetes worldwide was approximately 170 million and 280 million in 2000 and 20
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